JPS6031870Y2 - hacksaw machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a portable hacksaw machine in which the saw blade performs cutting work by pendulum motion that traces an arcuate locus, that is, an arcuate locus.

It is extremely ideal to perform cutting while the saw blade traces an arcuate movement trajectory and makes point contact with the material to be cut, since the cutting surface is always maintained at right angles and the cutting is performed efficiently.

As a hacksaw machine of this kind, the applicant's Utsukko 27-4895
It is known from the publication no.

In this known device, an arcuate upper holding rod of the saw blade holder is held by a fixed group of trochanters, and the saw blade moves in an arc together with the upper holding rod.

However, the hacksaw machine of this known design has the disadvantage that the trochanter group and the retaining rod wear out on both the upper and lower side surfaces over time, causing the saw blade to no longer draw an ideal arcuate locus of motion.

The object of the invention is to create a hacksaw machine of the type mentioned at the outset, which does not have the disadvantages of the known hacksaw machines mentioned above.

The gist of the present invention is that the saw blade holding frame is formed into a trapezoid by the left and right side frames attached to both ends of the upper frame so as to be slightly flared downward, and the saw blade screwed to these frames at the lower end. In a hacksaw machine having one saw, the lower portions of the left and right side frames of the saw blade holding frame are connected to a laterally extending support via an axis pin, and are similarly slightly inclined in a downwardly expanding shape. The left and right swinging levers, each of equal length, are pivoted to the lower part of the lever, and are swingably suspended by an attached shaft pin, and one side frame is linked to the motor in a downward position relative to its entire length. The saw blade is connected via a rod to a crank pin provided on a transmission gear that rotates at a reduced speed, so that the saw blade moves downward in a convex arcuate locus.

The present invention will be described in detail below with reference to embodiments illustrated in the drawings.

Reference numeral 1 designates a trapezoidal saw blade holding frame, which is fixed to the upper frame on the upper side thereof, and has both side frames 2 and 3 which are oriented to widen at the end, and a saw blade 6 which is fixed by screws at both ends of this side frame.
to be intimidating.

7 is a support body fixed to the motor casing 17 and extending in the lateral direction.

10.11 is a thrust bearing 8a on the support body 7,
These are swing levers of equal length that are swingably suspended by shaft pins 8 and 9 with a shaft 9a interposed between them, and these swing levers are connected to the shaft pin at their lower ends via the above-mentioned side frames 2 and 3 and thrust bearings 4a and 5a. 4.5, it is swingably connected.

In this case, the distance between the shaft pin 4 and the shaft pin 8 and the shaft pin 5
and the distance between the shaft pin 9 and the shaft pin 9 are equal.

Reference numeral 14 denotes a transmission gear which is coupled to the motor 13 in an appropriate manner and rotates at a reduced speed.

This power section is connected to the side frame 3 via a crank pin 15 that rotates on its inner peripheral surface and a rod 16 that is rotatably connected to the crank pin 15, and is connected to the side frame 3 and the shaft at a substantially lower position with respect to the entire length of this side frame 3. It is articulated via a pin 12, whereby the movement of the power section is transmitted to the side frame 3.

Reference numeral 18 denotes a rotation shaft for pivotally connecting the motor casing 17 to the machine body 19 so as to be able to rise and fall freely.

20 is a bundle fixed to the support 7, 21 is a tightening screw shaft, 22 is a tightening bundle, 23 is a switch for starting and stopping the motor 13, 24 is a stopper for automatic stopping 25
26 is a cord, 26 is a base, 27 is a material to be cut, 28 is a stop bundle, and 29 is a holding member for the material to be cut.

Next, the handling of this embodiment will be explained.

First, the hacksaw machine according to the present invention is carried to the site, and as shown in FIG. 5, the saw blade holding frame 1 is pulled up together with the support body 7 using the bundle 20 around the rotation shaft 18, and has a mechanism for holding the pulled up position. The stop bundle 28 is operated and held and fixed in the raised position (dotted line).

Next, place the material to be cut 27 on the base 26 below the saw blade 6, then operate the stop bundle 28 to release the fixation, bring the saw blade 6 into contact with the material to be cut 27, and tighten. bundle 22
For tightening, rotate the screw shaft 21 and fix it with the holding member 29.

Next, switch 23 is lowered to start motor 13.

Then, the transmission gear 14 rotates with appropriate deceleration.

This rotational force is applied to a rod 16 connected to the crank pin 15.
is transmitted to the side frame 3 via.

Here, the rotational motion of the gear 4 in the crank portion is converted into a reciprocating motion by the joint formed by the rod 16 of the side frame 3 and the pin 12.

(FIG. 4 a" d) The cutting action of the saw blade 6 on the material 27 to be cut will be explained below.

State of FIG. 4a FIG. 4a shows a state in which the swing lever 10.11 is located at the neutral point of its pendulum movement with the pivot pin 8.9 as the fulcrum.

In this state, the crank pin 15 is located at the lowest point in the diagram of circular motion.

The state shown in FIG. 4 In FIG. 4, the crank pin 15 is located at the leftmost end in the diagram of circular motion, and the shaft pins 4, 5 of the swing lever 10.11 are located at the leftmost end of the pendulum motion.

State of FIG. 4C FIG. 4C shows a state in which the pendulum movement enters a backward stroke from the state of FIG. 4C and returns to the neutral point again.

In this state, the crank pin 15 is located at the top end of its circular motion.

The state of FIG. 4d FIG. 4d shows the state in which the swinging lever 10.11 is in the final position of the pendulum movement.

At this time, the crank pin 15 is located at the rightmost end of the circular motion.

The "return" stroke ends in the state shown in FIG. 4(d), and the "forward" stroke begins again, returning to the state shown in FIG. 4(a).

Due to the pendulum movement of the holding frame 1 shown in FIG. 4 a = d as described above, the saw blade 6 repeatedly cuts the material 27 to be cut.

As described above, during this time, the holding frame 1 continues to descend together with the support body 7 and the motor casing 17 as shown in FIG.

That is, the above-mentioned reciprocating motion is not a simple linear reciprocating motion, but a reciprocating motion that draws a bow-like arcuate locus.

This operation is repeated, and the saw blade 6 constantly reciprocates downward in a convex arc, and the material to be cut 27.
ideally cut.

This is because the saw blade contacts the material to be cut only tangentially.

Next, when the cutting is completed, the motor casing 17 is lowered and the switch 23 is flipped upward by the stopper 24, thereby cutting off the power transmission and stopping the motor 13.

Since the thrust bearings 4a, 5a, 8a, 9a inserted between the shaft pins 8, 9 and 4, 5 have almost no wear, the saw blade 6 can perform an arcuate reciprocating motion for a long period of time.

As described above, the hacksaw machine according to the present invention improves cutting efficiency, makes the cutting surface perpendicular, and performs rational cutting operations, and the effects in actual use are quite remarkable.

[Brief explanation of drawings]

Fig. 1 is a front view of one embodiment of the hacksaw machine according to the present invention with the gear cover removed, Fig. 2 is a rear view of Fig. 1, Fig. 3 is a plan view of Fig. 1, and Fig. 4. a. b, C, d are explanatory diagrams of the cutting action of the saw blade holding frame 1;
The figure is an exploded explanatory view of the device of the present invention, 1... Saw blade holding frame, 2, 3... Side frame,
4,5゜8.9,12,15...Axis pin, 6.
... Saw blade, 7 ... Support, 10, 11.
... Swing lever, 13 ... Motor, 14
......Transmission gear, 16...Rod, 17
...Motor casing, 18...Rotation shaft, 19...Machine body.

Claims (1)

[Scope of utility model registration request] The saw blade holding frame 1 is shaped into a trapezoid by left and right side frames 2 and 3, which are attached to both ends of the upper frame at a slight inclination to widen downwards, and a saw blade 6 screwed to these at the lower end. In a hacksaw machine having one saw, the lower parts of both side frames 2.3 of the saw blade holding frame 1 are similarly lowered to a laterally extending support 7 via shaft pins 8, 9. The left and right swing levers 10 and 11, each having the same length, are pivotally mounted with a slight inclination to widen in the direction of the arrow. The side frame 3 is connected via a rod 16 and a crank pin provided on a transmission gear 14 that is rotated at a reduced speed in conjunction with a motor 13 in a downward position relative to its entire length, and the saw blade 6 is shaped like a convex arc downward. A hacksaw machine characterized by being configured to move by drawing a circular arc locus.